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  <title>Seek to specified line</title>

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</div><hr /><div id="splfileobject.seek" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">SplFileObject::seek</h1>
  <p class="verinfo">(PHP 5 &gt;= 5.1.0)</p><p class="refpurpose"><span class="refname">SplFileObject::seek</span> &mdash; <span class="dc-title">Seek to specified line</span></p>

 </div>

 <div class="refsect1 description" id="refsect1-splfileobject.seek-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type"><span class="type void">void</span></span> <span class="methodname"><strong>SplFileObject::seek</strong></span>
    ( <span class="methodparam"><span class="type">int</span> <code class="parameter">$line_pos</code></span>
   )</div>

  <p class="para rdfs-comment">
   Seek to specified line in the file.
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-splfileobject.seek-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">line_pos</code></em></dt>

     <dd>

      <p class="para">
       The zero-based line number to seek to.
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-splfileobject.seek-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   没有返回值。
  </p>
 </div>


 <div class="refsect1 errors" id="refsect1-splfileobject.seek-errors">
  <h3 class="title">错误／异常</h3>
  <p class="para">
   Throws a <a href="class.logicexception.html" class="classname">LogicException</a> if the 
   <em><code class="parameter">line_pos</code></em> is negative.
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-splfileobject.seek-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-3877">
    <p><strong>Example #1 <span class="methodname"><strong>SplFileObject::seek()</strong></span> example</strong></p>
    <div class="example-contents"><p>This example outputs the third line of the script which is found at position 2.</p></div>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$file&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">SplFileObject</span><span style="color: #007700">(</span><span style="color: #0000BB">__FILE__</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$file</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">seek</span><span style="color: #007700">(</span><span style="color: #0000BB">2</span><span style="color: #007700">);<br />echo&nbsp;</span><span style="color: #0000BB">$file</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">current</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

    <div class="example-contents"><p>以上例程的输出类似于：</p></div>
    <div class="example-contents screen">
<div class="cdata"><pre>
$file-&gt;seek(2);

</pre></div>
    </div>
   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-splfileobject.seek-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="methodname"><a href="splfileobject.current.html" class="methodname" rel="rdfs-seeAlso">SplFileObject::current()</a> - Retrieve current line of file</span></li>
    <li class="member"><span class="methodname"><a href="splfileobject.key.html" class="methodname" rel="rdfs-seeAlso">SplFileObject::key()</a> - Get line number</span></li>
    <li class="member"><span class="methodname"><a href="splfileobject.next.html" class="methodname" rel="rdfs-seeAlso">SplFileObject::next()</a> - Read next line</span></li>
    <li class="member"><span class="methodname"><a href="splfileobject.rewind.html" class="methodname" rel="rdfs-seeAlso">SplFileObject::rewind()</a> - Rewind the file to the first line</span></li>
    <li class="member"><span class="methodname"><a href="splfileobject.valid.html" class="methodname" rel="rdfs-seeAlso">SplFileObject::valid()</a> - Not at EOF</span></li>
   </ul>
  </p>
 </div>


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